F.83
Vaillant
Insufficient Water Flow / Incorrect Temperature Rise
F.83 temperature rise fault; appliance may start but quickly shut down
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Partially blocked plate heat exchanger, Low water flow through DHW circuit, Faulty flow sensor, Air in heat exchanger
How to Fix / Troubleshooting
Safety: Isolate power and gas before opening the casing.
- Check DHW flow: Open a hot tap fully and verify that flow meets the appliance’s minimum requirement. Clean tap aerators and shower heads if restricted.
- Clean plate heat exchanger: Remove and descale the DHW plate heat exchanger if there are signs of restriction or temperature spikes.
- Inspect flow sensor: Ensure the flow sensor/turbine is clean and spinning freely. Replace if worn or sticking.
- Bleed air: Remove air from the DHW circuit and heat exchanger.
- Reset and test: After restoring proper flow, reset the fault and test under full hot water demand.
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Repair Difficulty
Hard
4/5
Required Part
DHW Plate Heat Exchanger
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